US4283286A - Centrifuge with product accelerator - Google Patents

Centrifuge with product accelerator Download PDF

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Publication number
US4283286A
US4283286A US06/112,459 US11245980A US4283286A US 4283286 A US4283286 A US 4283286A US 11245980 A US11245980 A US 11245980A US 4283286 A US4283286 A US 4283286A
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US
United States
Prior art keywords
drum
product
distributor
ribs
shaft
Prior art date
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Expired - Lifetime
Application number
US06/112,459
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English (en)
Inventor
Helmut Wilkesmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mannesmann Demag Krauss Maffei GmbH
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Krauss Maffei AG
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Publication date
Application filed by Krauss Maffei AG filed Critical Krauss Maffei AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/06—Arrangement of distributors or collectors in centrifuges

Definitions

  • My present invention relates to a centrifuge and, more particularly, to an improved product accelerator distributor for a centrifuge, especially a centrifuge having an upright axis and preferably a wobble centrifuge.
  • Centrifuges having upright axes, especially wobble centrifuges are disclosed, for example, in German patent publication (Open Application--Offenlegungsschrift) DE-OS No. 24 59 796 and in other literature to be mentioned below.
  • This publication in particular, refers to a product accelerator or distributor coupled with the centrifuge drum, aligned with the source of the product to be centrifuged, adapted, because of the arrangement of openings, to uniformly spread the product upon the interior of the centrifuge drum.
  • This accelerator has the additional purpose of imparting a rotary movement to the product in the direction of drum rotation so as to conform the rotary velocity at least in part to the rotational speed of the drum, the product entering from the axially aligned or coaxial inlet with practically no rotational component.
  • the lateral openings in the distributor or product accelerator are generally formed between flanks which are substantially radial.
  • Another object of my present invention is to provide an improved centrifuge which has reduced downtime and better surface life than has been possible for similar centrifuges of the prior art.
  • a further object of the invention is to provide a product distributor and accelerator for wobble and other centrifuges having upright axes in which wear of the effective surfaces can be more easily monitored, which facilitates replacement of the distributor, and which is less affected by dynamic forces than earlier systems.
  • a centrifuge having a housing, a centrifuge drum rotatable in this housing about at least one upright axis (the centrifuge being of the fixed-axis or of the wobble type), at least one drive shaft rotatable in the housing and operatively connected to the drum for rotating same, drive means connected to this drive shaft and displacing both the shaft and the drum so as to cause a product to be centrifuged in the drum, an inlet for this product opening along or parallel to this axis and extending into the housing, and a distributor operatively connected to the shaft (e.g. directly or via the drum) and positioned to intercept the product introduced at the inlet for distributing the product uniformly onto the drum.
  • the distributor is formed with a circular array of angularly equispaced scoop-shaped ribs or vanes accelerating the product in the direction of rotation of the drum and distributor and radially directing the product outwardly onto the interior of the drum.
  • the ribs have product-displacing surfaces (facing in the direction of rotation) which are of concave curvature and extend radially inwardly to include acute angles with a circle centered on the axis of the distributor and pointing in the direction of rotation.
  • each rib widens outwardly from an apex at the point of this angle and has a curved rear flank which is convex.
  • the scoop-shaped configuration of the ribs provides a relatively small attack angle of the innermost edges formed by the above-mentioned vertex of the acute angle and thereby minimizes wear along the inlet portion of the surface, i.e. that portion of the concave surface which first encounters the product and lies at the interior of the outwardly extending slots formed between the ribs.
  • the distributor can be partly or completely replaced with ease.
  • the wear is generally confined to the aforementioned tips so that the distributor has a long useful life.
  • the blades or ribs are members separate from the disk of the distributor to which they are attached and can be removed and replaced individually.
  • the ribs may be provided with bores traversed by bolts which can also serve to mount the drum upon the distributor.
  • the curvature of the forward surface extends to the outer edge of the rib.
  • FIG. 1 is a partial diagrammatic vertical axial cross-sectional view of a centrifuge according to the present invention.
  • FIG. 2 is a partial section taken along the line II--II of FIG. 1 diagrammatically illustrating the distribution of the product upon the drum.
  • FIG. 1 I have shown a centrifuge in which the housing or support comprises a bearing-mounting sleeve 1 in which an outer shaft 4 is journaled by a pair of bearings 2 and 3.
  • Shaft 4 provided at its upper end with a flange 4a whose upper surface 4b is inclined to the vertical axis 4c of the hollow shaft 4.
  • the lower end of shaft 4 is provided with a pulley 6 engaged by a belt 7 connected to a drive motor (see U.S. Pat. No. 4,153,551).
  • the flange 4a is bolted to a flange 5a of a hollow shaft 5 which is thus canted with respect to the axis 4c and has an axis 5b.
  • the latter is journaled by bearings 8 and 9 in the hollow shaft 5 and carries a disk 18a forming the support for the product distributor 18.
  • the pivot center 36 of the universal joint 15 is disposed in the plane of the interface between the flanges 4a and 5a.
  • a radially extending flow passage 17 is provided in the upwardly open product accelerator 18. Into this opening or passage extends an inlet pipe 19 which can be generally aligned along the axis 4c.
  • the housing is provided with a removable cover 23 traversed by the inlet pipe 19.
  • the product accelerator 18 is connected by bolts 37 with an annular disk 20 forming the upper end of a downwardly widening frustoconical centrifuge drum 21 provided with perforations 21a through which the liquid phase of the slurry forming the product may be discharged (see, e.g. U.S. Pat. No. 4,153,551).
  • This drum is provided along its exterior with a frustoconical upwardly diverging collecting apron 22.
  • the housing also includes a downwardly frustoconical upper housing portion 24 carrying the cover 23 and affixed to the lower housing part 25 mounted by feet 29 upon a foundation.
  • the connection between the upper and lower portions of the housing is effected by plates 28 which provide passages 28a between them.
  • a bottom plate 26 is welded, this plate having a central opening 26a in which the bearing sleeve 1 is received.
  • the bearing sleeve 1 has a flange 1a bolted to the plate 26 which is formed outwardly of the bearing sleeve with throughgoing openings 30.
  • the centrifuge as described is of the wobble type operating with the principles of the wobble centrifuges of the prior art mentioned previously.
  • the slurry is introduced through the inlet tube 19 in the direction of arrow 31 and is accelerated and distributed by the distributor 18 onto the interior of the drum 21. Centrifugal operation forces the liquid through the perforations 21a where it is collected by the upper housing portion 24 or the apron 22 and traverses the positions 28a between the ribs 28 to flow in the direction of arrow 32, guided by an apron 32a.
  • the solids are thrown from the lower end of the drum and pass in the direction of arrow 33 into a collecting funnel or hopper 27.
  • the displacement of the solids is effected as a result of the wobble movement generated by rotating the shafts 4,5 and the shafts 11,12 with a speed difference such that the wobble impulse attains the friction angle of the solids or exceeds the friction angle thereof.
  • the product accelerator 18 is shown in greater detail in FIG. 2 and comprises a circular array of blades or ribs 28 which are concave forwardly and convex rearwardly with respect to the direction of rotation.
  • each rib At their radially innermost region, at a circle of a radius RI each rib has a vertex or apex and from this apex diverges outwardly between a forward surface 49 and a rear flank 40, these surfaces including progressively increasing angles between them outwardly.
  • the ribs are individually replaceable readily and can be positioned without difficulty by aligning their outermost faces 38a with the circumference of the plate 18a.
  • the surfaces 39 form acute angles with the circle of radius RI and with the respective rear flanks 40.
  • the radial passages 17 are provided between the individual ribs 38, these passages being of constant width and cross-sectional area and shaped radially outwardly.
  • the centrally supplied product is captured by the tips 38a upon rotation of the distributor and is radially outwardly displaced with a velocity in the direction of rotation which increases from practically zero to an annular velocity equal to that of the drum 21 in the region of the outermost edge of the surfaces 39 before the product particles are cast against the drum. Wear is minimized when the particles receive the same annular velocity as the drum. This has been found to be the case when the surface 39 includes an acute angle with the circle of radius RA pointing in the direction of rotation 42 although this angle need not be as small as the attack angle.
  • the peripheral velocity of the product as it leaves the distributor is thus greater than the peripheral speed of the distributor itself.
  • ribs or blades of a wear-resistant material such as hard-surfaced metal, hard metal such as titanium or tungsten containing steels and sintered ceramics.
  • the blades can be replaced individually, because of the unique mounting system. It can also be noted that the mounting system applies only compressing forces to the hard metal ribs which cannot readily sustain tension. Even in the case in which the throughput drop is not immediately noted, no damage to the centrifuge can occur.
  • the product accelerator of the present invention need not be in the force transmission path between the drive shaft and the drum but can be rotated by other means.

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  • Centrifugal Separators (AREA)
US06/112,459 1979-01-17 1980-01-16 Centrifuge with product accelerator Expired - Lifetime US4283286A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2901643 1979-01-17
DE19792901643 DE2901643A1 (de) 1979-01-17 1979-01-17 Zentrifugen-produktbeschleuniger

Publications (1)

Publication Number Publication Date
US4283286A true US4283286A (en) 1981-08-11

Family

ID=6060747

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/112,459 Expired - Lifetime US4283286A (en) 1979-01-17 1980-01-16 Centrifuge with product accelerator

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US (1) US4283286A (fr)
BE (1) BE881175A (fr)
DE (1) DE2901643A1 (fr)
GB (1) GB2039768B (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4451371A (en) * 1983-01-10 1984-05-29 Peck William H Apparatus for separating liquid from a slurry
US5401423A (en) * 1991-11-27 1995-03-28 Baker Hughes Incorporated Feed accelerator system including accelerator disc
US5520605A (en) * 1991-12-31 1996-05-28 Baker Hughes Incorporated Method for accelerating a liquid in a centrifuge
US5527258A (en) * 1991-11-27 1996-06-18 Baker Hughes Incorporated Feed accelerator system including accelerating cone
US5651756A (en) * 1991-11-27 1997-07-29 Baker Hughes Inc. Feed accelerator system including feed slurry accelerating nozzle apparatus
WO2000000301A1 (fr) * 1998-06-30 2000-01-06 Semitool, Inc. Processeur a rotor deporte pour support plat
US20040121892A1 (en) * 2002-12-03 2004-06-24 Zonneveld Edwin John William Centrifugal separation bowl with material accelerator
US20050245381A1 (en) * 2004-04-30 2005-11-03 National-Oilwell, L.P. Centrifuge accelerator system
RU2799946C1 (ru) * 2023-04-06 2023-07-14 Юрий Павлович Мурзин Гидравлический привод колеса

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3150975C2 (de) * 1981-12-23 1985-05-09 Krauss-Maffei AG, 8000 München Taumelzentrifuge
DE4414118A1 (de) * 1994-04-22 1995-10-26 Krauss Maffei Ag Schubzentrifuge

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US403910A (en) * 1889-05-28 Centrifugal machine foe treating grain
US1520467A (en) * 1921-05-31 1924-12-23 Albert D Frantz Centrifugal machine
US1829547A (en) * 1927-03-11 1931-10-27 Sharples Specialty Co Centrifugal process and apparatus
US2312545A (en) * 1939-04-05 1943-03-02 Anton J Haug Centrifugal screening machine for paper stock and similar material
DE948409C (de) 1954-07-10 1956-08-30 Krauss Maffei Ag Einlaufvorrichtung fuer das Schleudergut in Schubzentrifugen
DE970399C (de) 1951-06-21 1958-09-18 Krauss Maffei Ag Einlaufvorrichtung fuer Schubzentrifugen
US3075693A (en) * 1959-05-11 1963-01-29 Gen Motors Corp Centrifuge filtration
DE1197813B (de) 1961-07-15 1965-07-29 Krauss Maffei Ag Schubzentrifuge
US3233735A (en) * 1963-01-24 1966-02-08 Krauss Maffei Ag Centrifuge
DE2127458A1 (en) 1971-06-03 1972-12-14 Krauss-Maffei AG, 8000 München Tiltable filter centrifuge - in which acceleration on tilting distributes solids over wall sieve outlets
US4153551A (en) * 1977-03-11 1979-05-08 Krauss-Maffei Ag Wobble centrifuge and method of operation
US4184964A (en) * 1977-08-12 1980-01-22 Krauss-Maffei Ag Centrifuge
DE2459796C3 (de) 1974-12-18 1981-04-30 Krauss-Maffei AG, 8000 München Zentrifuge

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US403910A (en) * 1889-05-28 Centrifugal machine foe treating grain
US1520467A (en) * 1921-05-31 1924-12-23 Albert D Frantz Centrifugal machine
US1829547A (en) * 1927-03-11 1931-10-27 Sharples Specialty Co Centrifugal process and apparatus
US2312545A (en) * 1939-04-05 1943-03-02 Anton J Haug Centrifugal screening machine for paper stock and similar material
DE970399C (de) 1951-06-21 1958-09-18 Krauss Maffei Ag Einlaufvorrichtung fuer Schubzentrifugen
DE948409C (de) 1954-07-10 1956-08-30 Krauss Maffei Ag Einlaufvorrichtung fuer das Schleudergut in Schubzentrifugen
US3075693A (en) * 1959-05-11 1963-01-29 Gen Motors Corp Centrifuge filtration
DE1197813B (de) 1961-07-15 1965-07-29 Krauss Maffei Ag Schubzentrifuge
US3233735A (en) * 1963-01-24 1966-02-08 Krauss Maffei Ag Centrifuge
DE2127458A1 (en) 1971-06-03 1972-12-14 Krauss-Maffei AG, 8000 München Tiltable filter centrifuge - in which acceleration on tilting distributes solids over wall sieve outlets
DE2459796C3 (de) 1974-12-18 1981-04-30 Krauss-Maffei AG, 8000 München Zentrifuge
US4153551A (en) * 1977-03-11 1979-05-08 Krauss-Maffei Ag Wobble centrifuge and method of operation
US4184964A (en) * 1977-08-12 1980-01-22 Krauss-Maffei Ag Centrifuge

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4451371A (en) * 1983-01-10 1984-05-29 Peck William H Apparatus for separating liquid from a slurry
US5651756A (en) * 1991-11-27 1997-07-29 Baker Hughes Inc. Feed accelerator system including feed slurry accelerating nozzle apparatus
US5401423A (en) * 1991-11-27 1995-03-28 Baker Hughes Incorporated Feed accelerator system including accelerator disc
US5527258A (en) * 1991-11-27 1996-06-18 Baker Hughes Incorporated Feed accelerator system including accelerating cone
US5658232A (en) * 1991-11-27 1997-08-19 Baker Hughes Inc. Feed accelerator system including feed slurry accelerating nozzle apparatus
US5840006A (en) * 1991-12-31 1998-11-24 Baker Hughes Incorporated Feed accelerator system including accelerating vane apparatus
US5632714A (en) * 1991-12-31 1997-05-27 Baker Hughes Inc. Feed accelerator system including accelerating vane apparatus
US5551943A (en) * 1991-12-31 1996-09-03 Baker Hughes Incorporated Feed accelerator system including accelerating vane apparatus
US5520605A (en) * 1991-12-31 1996-05-28 Baker Hughes Incorporated Method for accelerating a liquid in a centrifuge
US6077210A (en) * 1991-12-31 2000-06-20 Baker Hughes Incorporated Feed accelerator system including accelerating vane apparatus
WO2000000301A1 (fr) * 1998-06-30 2000-01-06 Semitool, Inc. Processeur a rotor deporte pour support plat
US6125863A (en) * 1998-06-30 2000-10-03 Semitool, Inc. Offset rotor flat media processor
US20040121892A1 (en) * 2002-12-03 2004-06-24 Zonneveld Edwin John William Centrifugal separation bowl with material accelerator
US6986732B2 (en) * 2002-12-03 2006-01-17 Knelson Patent Inc. Centrifugal separation bowl with material accelerator
US20050245381A1 (en) * 2004-04-30 2005-11-03 National-Oilwell, L.P. Centrifuge accelerator system
RU2799946C1 (ru) * 2023-04-06 2023-07-14 Юрий Павлович Мурзин Гидравлический привод колеса

Also Published As

Publication number Publication date
GB2039768B (en) 1983-01-12
BE881175A (fr) 1980-05-16
GB2039768A (en) 1980-08-20
DE2901643A1 (de) 1980-07-31

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